Mexico’s tax and customs landscape is undergoing a phase of intensive enforcement by tax authorities, driven by public policies aimed at increasing revenue collection, closing tax evasion loopholes, and combating the misuse of aggressive tax planning schemes.
The implementation of digital systems such as CFDI 4.0, the Tax Mailbox, volumetric control for hydrocarbons, and AI-based audits has strengthened the authorities’ capacity to detect omissions, inconsistencies, and presumed non-compliance. This has led to a significant rise in:
- Electronic and in-person audits.
- Fast-track audit procedures.
- Mass information requests.
- Restrictions on Digital Seal Certificates (CSD).
- Denials of tax refund requests.
- Precautionary embargoes and customs enforcement actions.
In this context, it is essential for both individuals and legal entities to have a clear legal strategy to confront administrative actions issued by SAT, the National Customs Agency (ANAM), the Financial Intelligence Unit (UIF), and other authorities, using the legal defense mechanisms provided under Mexican law.
a) Revocation Appeal (Article 117 of the Federal Fiscal Code – CFF).
An administrative remedy allowing taxpayers to challenge authority actions without resorting to courts, seeking a review by the same issuing authority.
Common actions subject to appeal:
- Tax assessments resulting from audits.
- Fines for tax or customs violations.
- Denials of tax refunds.
- Restrictions or cancellation of Digital Seal Certificates (CSD).
Deadline: 30 business days from the day after the notification becomes effective.
Advantages:
- More agile and cost-effective process.
- Does not require a fiscal interest guarantee.
- May temporarily halt enforcement of the challenged action.
Disadvantages:
- Resolved by the same authority that issued the act.
- Rarely favorable to the taxpayer unless strongly supported by legal and technical arguments.
b) Administrative Litigation (Annulment Lawsuit)
Filed before the Federal Court of Administrative Justice (TFJA) to declare the nullity of illegal actions issued by tax or customs authorities.
Applicable to:
- Final administrative actions (tax assessments, revocation decisions, denial of refunds, customs rulings, etc.).
- Omissions by authorities causing direct harm.
Types:
- Ordinary: Standard procedure.
- Summary: Streamlined procedure for lower-value matters or when only fines are disputed.
Deadline: 30 business days from the date the notification takes effect (or from the revocation resolution date, if applicable).
Advantages:
- Adjudicated by an autonomous tribunal.
- Enforcement may be suspended via fiscal guarantee.
- Greater likelihood of success when illegality is substantiated.
c) Direct Amparo Lawsuit.
Filed before the Collegiate Circuit Courts, this remedy applies only against final judgments that conclude a judicial instance, provided no further ordinary appeal is available.
In tax and customs matters, it is commonly used to challenge decisions by the TFJA after the annulment process has been exhausted.
Applicable to:
- Final judgments issued by TFJA on tax assessments, PAMA resolutions, refund denials, etc.
- Final decisions by administrative courts that violate constitutional rights.
Deadline: 15 business days from the day after the notification of the judgment takes effect.
Advantages:
- Reviews legality and constitutionality of judicial decisions.
- Decided by an impartial and autonomous court.
- Can result in the protection of fundamental rights such as legal certainty, legality, and tax proportionality.
Disadvantages:
- Requires prior exhaustion of judicial instance (e.g., annulment lawsuit).
- Formal requirements are strict.
- Does not reopen factual analysis; focuses on legal or constitutional violations.
d) Indirect Amparo Lawsuit (Extraordinary Remedy).
This is an extraordinary legal defense, not intended to replace ordinary remedies (like revocation or annulment lawsuits), and is used exclusively when constitutional rights or human rights are at risk of irreparable harm.
Filed before Federal District Courts, it aims to protect taxpayers from arbitrary, illegal, or procedurally excessive actions by authorities.
Applicable to:
- Freezing of bank accounts without a final ruling.
- Unauthorized access to a taxpayer’s premises.
- Arbitrary seizures during audits.
Deadline: 15 business days from the date of the challenged act (may vary by case type).
Advantages:
- May grant immediate provisional suspension.
- Protects key constitutional rights (due process, hearing, property, legal certainty).
Special considerations:
- Cannot substitute ordinary legal remedies.
- If a viable ordinary remedy exists but is not exercised, the amparo may be dismissed.
- Requires careful constitutional and legal analysis for admissibility.
- Act promptly: Deadlines for challenging tax or customs acts are short. Missing them implies consent.
- Gather and preserve supporting documentation: The burden of proof falls on the taxpayer. Key documents include invoices, contracts, accounting records, inventory logs, and permits.
- Assess the most appropriate legal strategy: Not all cases require exhausting the revocation appeal; direct annulment may be more effective in many cases.
- Consider suspension of the challenged action: To avoid immediate financial harm, a suspension can be requested by providing a fiscal guarantee.
- Seek advice from experts: Poorly structured defenses can be dismissed or lack technical merit, weakening the legal position.
At ST STRATEGO, we have over 20 years of combined experience in both the public and private sectors, advising and representing domestic and international companies before tax and customs authorities. Our team consists of highly specialized litigators in tax, administrative, and international trade law, with deep knowledge of the current legal framework.
We provide technical, strategic, and effective legal defense, safeguarding our clients’ interests throughout administrative proceedings and litigation.
Our approach is based on:
- Thorough technical and regulatory analysis of each government action.
- Design and execution of comprehensive legal defense strategies.
- Legal representation in tax audits, PAMA procedures, embargoes, site visits, cargo inspections, and related proceedings.
- Specialized litigation before the Federal Court of Administrative Justice and Federal Judiciary.
Our commitment is to deliver effective legal solutions, anticipate risks, and protect your company’s operations and compliance in a complex regulatory environment.
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